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  <script>

    // 创建正则
    // 1> 匹配的规则pattern
    // 2> 匹配的修饰符flags
    const re1 = new RegExp("abc", "ig")
    const re2 = /abc/ig // 我是注释
    // 创建：通过类、通过字面量
  </script>

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